Hakley stone



UNITE STAT FATENT HARLEY STONE, OF BLACKSTONE, MASSACHUSETTS, ASSIGNORTO IAUL I. TODD, OF SAME PLACE.

EXPANDING- BIT.

Specification of Letters Patent No. 22,474, dated December 28, 1858.

'lb all whom fit may concern:

Be it known that I, HARLEY STONE, of Blackstone, in the county oflVorcester and State of Massachusetts, have invented a new and usefulImprovement on Dilating Bits or Angers; and I do hereby declare that thefollowing is a full, clear, and exact description of the constructionand operation of the saine, reference being had to the annexed drawings,making a part of this specification, in whichy Figure l, is aperspective View of the bit as a whole; Fig. 2, of the niain bit; Fig.3, ot' the bit as spread; Fig. 4, ofthe slide cutter', F ig. 5, of thebolt which fastens the parts together.

The nature and construction of my invention consists of a bit --Fig. l,A with one lip -a into which is dovetailed a slide cutter -B- in whichis a diagonal slit *O-. Opposite to this, and in the inain bit, isanother slit Fig 2, D of equal length, near to, and running parallelwith, the edge of the niain bit. Through the two slits is passed a smallsliding bolt F ig. 5, E- having upon one end a nut -cand upon the othera round flat head, both ot' which project over the edges of the slits.Stamped upon the niain bit and slide cutter is a graduated scale -F-f bynieans of which the exact size can be deterlnined.

The operation is-to loosen the nut -cand crowd the bolt En toward thegiinlet of the bit, till it is spread to the required size as indicatedby the graduated scale, and vice versa.

I claimrThe inode and application of the slide cutter -B- the slits -Cand D- the bolt -E- and the graduated scale Ff and constructed andoperating as above set forth and described.

In testimony whereof I have hereunto set iny hand in the presence of twowitnesses.

HARLEY STONE.

Vitnesses IVALTER Ti-rokrn, DANIEL B. POND.

